Product Description
No.4 A2 stainless steel Pozi flange-head self-tapping screws manufactured to BS 4174, available in a 1/2" imperial length.
These Type AB self-tapping screws feature a cross-recessed Pozi drive and a wide integral flange beneath the head. The flange provides a larger bearing surface than a conventional pan head, helping to spread the clamping load over the mating material and potentially removing the need for a separate flat washer in suitable applications.
- Screw size: No.4
- Approximate nominal diameter: 2.9mm
- Available length: 1/2"
- Approximate metric length: 13mm
- Material: A2 stainless steel
- Finish: Natural stainless steel
- Standard: BS 4174
- Self-tapping type: Type AB
- Head style: Flange head
- Drive type: Pozi
- Point style: Sharp self-tapping point
- Length measured from beneath the flange to the end of the point
- Pack sizes available: 10, 20, 50, 100, 250, 500 and 1000
Pozi flange-head self-tapping screws are commonly used for securing panels, covers, brackets, electrical equipment, appliances, machinery components, automotive trim and general engineering assemblies.
The integral flange spreads the clamping force over a wider area than a standard screw head. This can help reduce localised pressure on thinner materials and may remove the need to handle a separate washer during repetitive assembly work.
The Pozi drive provides positive engagement with a correctly sized Pozi screwdriver bit, helping transmit installation torque and reduce the likelihood of the driver slipping compared with a traditional slotted drive.
Type AB self-tapping screws combine a fine tapping thread with a sharp point. They form a mating thread as they are driven into a correctly sized pilot hole in suitable sheet metal, plastics and other compatible materials.
A2 stainless steel provides good general corrosion resistance for indoor and outdoor applications. For marine, coastal, swimming-pool or highly corrosive environments, A4 stainless steel may be more suitable.
These screws are self-tapping rather than self-drilling. A correctly sized pilot hole is normally required, particularly when installing into metal or other hard materials.
For flange-head screws, the length is measured from beneath the flange to the end of the point.
Please note: Flange diameter, head height and Pozi drive size are not currently stated. Specifications and metric conversions are intended as a guide only. Pilot-hole requirements and suitability depend on the material type, hardness and thickness. If dimensions or application requirements are critical, please check with us before ordering.
| A | B | C | D | E | F | G | H |
| No.4 | 2.9mm | 1/2" | 13mm | * | * | * | * |
Please Note: Specifications given are intended as a guide only. If critical to your project please check with us first.
